Electrically-controlled cut-out.



TI MURRAY L A. V. A. MCHARG.

ELRC''EIGMJLY CONTROLLED CUT-OUT.

A! 'f 'u MON NLED JULY 11. 1913.

L 20,222., Patented Dee. 8, 1914 2 SHEETS-SHEET 1.

MQHARG.

'u' who@ 2 SHEETSWSHEET 2.

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sfrarils PATENT cierren.

lr'gqmas' "121; AND ARTHUR v.`.`e. Mcriaiig," er NEW, YbnKgnpLfYl; 'sein Mariano Ass-m1101110 serniypannr. y K

LEc'rmcALLY-CONRLIQD CU'rcUT. f

spegincatitn of Lettergratnt; Y Patented beog, 1914.

Appiieatqnnlediuiy 1v1. 1913; @serial-Nd; 7785444.

Y, York, have invented a certain new and use- 7 ful Improvement in Electrically-Controlled fiGiitOuta, of which-the following is a specisfcatiorfz Y ,arfTh ,invention `is `an automatic electric 1clitoutgfor'releasing a switch lever of the V:lenifejtype `by electrically controlled mechanism.' fIt is so constructed that upon either .i anv overload or a` failure of current on the `lifSystem,.the device operates automatically totopencircuit by withdrawingthe fuse plu-g".- or fuse plugs; The device is here shown in a three-wire system wherein a fuse :':plug is provided in Aeach conductor, but ob- Ofiiously it. mayv be used in .one-branch or l.ifboth 'branches-cfa two-wire system, as vpre- ;-vferredp-sFoii. illustrative purposes it is here ishownlapplied to the lever of the electric cutbut-.setl forth `in an 'applicationl for Let# f=ters #Pate-nt, SerialA No. 64,491, filed by .iAirthui'. V, A. McHarg, April 30th, 1913, vandfnow pendin-gxfx,A

' 'Inffthe accompanying drawings-,Figure 1 1 `Tis Vlia7 side elevationxof our cutfout, --showing so the base'block'in section. Fig. 2 is a plan view,'\\'fith` the Ashield'broken away and the fuse-plugs in section. Fig. 3 is an end elevation.

Similar numbers: and letters of, reference indicate like parts: l

The base block 1 is preferably of refrac-- tory insulating material, such as porcelain,

and has two side walls 2, 3 and two inter- Y vmediate partitions so as vto divide the space 40 between said walls into three channels 4, 5, 6. Extending across said channels and passing through the walls 2, 3 and partitions are three mutually insulated superposed bus-bars 7, 8, 9.

10, 11, 12 arecircuit conductors of a three-wire system connected to plates 13, 14, 15 fixed respectively in channels 4, 5, 6. Each plate-has an upwardly extending projection which forms one member of a pair of contacts, the other members ofsaid contacts being similar projections on plates 16, 17, 18, also disposed in said channels and connected respectively to said bussbars by metal strips 19, 20,21. It willibe obvious that by inserting fuse plugs between the vat 26 to the` base block 1.

p airs of contacts in the several channel-s, `circuit will be established from bus-bars 7,

8, 9 to circuit conductors 10, 11, 12. Said fuse plugs are insertedv and removed by means of a switch lever 22, which comprises a supporting bar 23, to which are secured three parallel bell .crank levers, one of p which, 24, is longer than the others, and an operating handle 2 5. Switch 22 is pivoted The horizontal arms of the bell cranlrlevers enter openings in the fuse plugs 27. I.Che arm of lever 24 extends beyond the plug which it carries. Each plug consists of a carrier block of insulating material, having a thin upper portion over which is doubled a fuse strip 28 secured to said block. lVhen the switch is in the position shown in Fig. 1, the fuse plugs are brought into place between the pairs of contacts in the basel block channels. The switch is opened by means of handle V25fwhich, when swung tojthe vright A of Figi 1, causes said fuse plugs tol be simultaneously lifted out of said .pairs of contacts. The cross bvar'23 carries a shield 29.

The foregoing construction is more fully set forth in the aforesaid application of Arthur V. A. lVIcHarg.l i.

A'is a metal support, having a bottom plate and, integral tl'ierewith, two vertical plates B, C. The plate C has a projecting portion D disposed at right angles to its face.' Between the plates B, C is an electromagnet coil E, a polar extremity of the core of which passes through the plate C: Supported on' the projection D-is another electro=magnet coil F, a polar extremity of the core of which passes through said projection. The two electro-magnets E and F have a common armature formed of two plates G, H, disposed' at right angles, as best shown in Fig. 2. Said plates may be integral. The armature G, H is carried by a vertical arm l which is pivoted to swing at right angles to short arm 'J in turn pivoted in a bracket K extending from plate C. On the upper part of the arm I is a shoulder L. Bearing at one end on arm l is a strong bent'spring M which is coiled Varound the pivotcf arm J and bears at its nets are connected in series in circuit conductor 12. Secured to switch lever 22 and to base vblock-1 are hooked arms 30, between which is secured a helicalretracting spring P.

The operation is as follows: To establish circuit, the switch is closed. Electromagnet F is then energized and attracts part H of armature G, H, moving pivoted arm I against the pull of spring N until the'shoulder L on said arm rides' over and engages the extremity of the extended arm of bell crank lever 24, asv shown in Fig. 1. Current also flows through electro-magnet coil E, but armature Gr, H is' prevented from moving toward said coilv by the strong springM, sov long as normal current is maintained. But if an overload of'current occurs, then electro-magnet E overcomes spring M andv attracts armature G, H in a direction at right angles to that in Which said armature was previously attracted by electro-magnet F, Byfreason of this movement, the shoulder L is Withdrawn from engagement with bell crank arm 24, so that the spring P can now throw the switch lever to remove the -fuse plugs from the block contacts. On the lother hand, if instead of Van overload current coming on the system,

the existing current thereonfor any cause disappears, then the magnet F becomes Adeenergized and the coiled spring N retracts armature G, H, thus releasing .bell crank arm 24 from shoulder L and so accomplishing the "same result in removing the fuseV plugs from their coiitacts.A The fuse strip may lie normally in Contact with the oppo-v site side of its carrier or be somewhat separated therefrom so as to be compressed when inserted betweenthe block contacts and so exercisea slight resilient pressure on said contacts` Ordinarily in switch levers of the knifetype where the lever blade itself, or, as'in the present case, a fuse carrier supported thereon, coperates with `fixed contacts to close circuit, the construction is such that previously described, the frictional engagement of blade or usecarrier'and contacts may be slight, and hence easily overcome by the retracting spring, when the latch is 1. In combination witha movable Aswitch lever, and retracting means therefor, two

electro-magnets disposed at an angle one to the other, a latch movable toward either magnet when attracted thereby, and retracting means for said latch; the said parts being constructed and arranged so that said latch is moved in one direction by one of said magnets' to engage said lever and in. another direction by the other of said magnets to release lsaid lever. l

2. In combination with av movable-switch lever, two electro-magnets relatively disposed at right angles, an armaturecommon to both magnets, a 'Support for' lsaid armature permit\ :ingv its attraction by either magnet, two springs respectively opposing the movement 'of said armature in either direc# tion, and a shoulder-on said support engaging said switch lever when'said support is attracted toward'one otsaid magnets.

In testimony whereof we have affixed our;

signatures inpresence of two'witnesses.

' THOMAS E. MURRAY. ARTHUR V.. A., MGHARG.

Witnesses:

GERTRUDE TI( Pon'rnn, Mair T.' MCGARRY. 

